Motor differential protection test new method

The invention discloses a motor differential protection test new method. The new method is a real and intuitive reliability detection new method and comprises the steps of accomplishing the checking of main loop and secondary loop current vector and differential current of the differential protection at a time and the accuracy checking of a differential loop wiring. Through the new method disclosed by the invention, whether the differential main loop and the secondary loop wiring way is correct, whether the CT transformation ratio is matched with the angular difference, and whether the differential protection device fixed value and wiring are correct can be completely and really detected before the first power transmission of the motor main loop, so that the fault point of the whole differential protection system can be found in advance and eliminated in time before the equipment is put into use; an operation of checking the differential protection by using an online running way when performing the first trai